An ecologist who studies groups of populations that occur together in one area is a(n) ____ ecologist
a. behavioral
b. population
c. community
d. ecosystem
e. organismal
ANSWER: c
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_______________ hormone is significant in the female menstrual cycle, triggering maturation of an egg.
A. Follicle-stimulating B. Adrenocorticotropic C. Prolactin D. Growth
How do animals get enough calories and minerals in their diets?
What will be an ideal response?
Which sentence describes the width of a DNA double helix?
a. The width is greater where purines are present than where pyrimidines are present. b. The width is narrower where adenine is present than where cytosine is present. c. The width is constant. d. The width varies randomly.
Zero population growth is achieved when ____
a. a population reaches the carrying capacity of the environment b. emigration and immigration are balanced, and the number of births equals the number of deaths c. births exceed deaths d. deaths exceed births e. emigration and immigration are prevented